Papers by Eugenia Bugdaeva
The presumed ginkgophyte Umaltolepis has seed-bearing structures resembling those of Peltaspermales and Umkomasiales
Proceedings of the National Academy of Sciences of the United States of America, Jan 21, 2017
The origins of the five groups of living seed plants, including the single relictual species Gink... more The origins of the five groups of living seed plants, including the single relictual species Ginkgo biloba, are poorly understood, in large part because of very imperfect knowledge of extinct seed plant diversity. Here we describe well-preserved material from the Early Cretaceous of Mongolia of the previously enigmatic Mesozoic seed plant reproductive structure Umaltolepis, which has been presumed to be a ginkgophyte. Abundant new material shows that Umaltolepis is a seed-bearing cupule that was borne on a stalk at the tip of a short shoot. Each cupule is umbrella-like with a central column that bears a thick, resinous, four-lobed outer covering, which opens from below. Four, pendulous, winged seeds are attached to the upper part of the column and are enclosed by the cupule. Evidence from morphology, anatomy, and field association suggests that the short shoots bore simple, elongate Pseudotorellia leaves that have similar venation and resin ducts to leaves of living GinkgoUmaltolepi...
The rise and demise of Podozamites in East Asia – An extinct conifer life style
Palaeogeography, Palaeoclimatology, Palaeoecology, 2016
Paleontological Journal, Nov 30, 2010
Two new species of Sphenobaiera from the Baisa locality and Chernovskoe coal mine (Lower Cre tace... more Two new species of Sphenobaiera from the Baisa locality and Chernovskoe coal mine (Lower Cre taceous, Transbaikalia) are described. The cuticle of these plants inhabiting different environments differs significantly. Leaves of S. starukhiniae sp. nov. have a very thin cuticle, almost not sunken, open, nonpro tected stomata, while the leaves of S. vitimica sp. nov. have relatively thick and strong cuticle, well developed papillae overhang the sunken stomata. Guard cells of both species usually have fine radial striations. Appar ently, the first plant dwelt in wet habitats, and the second, in the areas with a temporary shortage of water. This reconstruction is confirmed by sedimentological data, coal bearing sediments (where S. starukhiniae sp. nov. was found) formed in swampy areas, carbonate deposits (S. vitimica sp. nov. was collected in marls of the Baisa locality), in the droughty one. It is not improbable that the cuticular features revealed of these two species contributed to more efficient water exchange and allowed plants to exist in these different environments.
602 On the exile ultrastructure of ginkgoaleans : dispersed pollen of presumed ginkgoalean affinity from the Early Cretaceous of Russia and pollen of extant Ginkgo biloba L
日本花粉学会会誌, Aug 23, 2012
The Early Cretaceous Flora of Razdol’naya River Basin (Primorye Region, the Russian Far East)
Botanica Pacifica, 2015
Stratigraphy and Geological Correlation, 2014
The plant remains and palynological assemblages are studied in detail in the section of the coal ... more The plant remains and palynological assemblages are studied in detail in the section of the coal bearing upper part of the Aptian Starosuchan Formation near the village of Molchanovka (Partizansk Basin, South Primorye region). On the basis of the light and electron microscopic study of the disperse cuticles, it was established that the coals are mostly composed of remains of taxodialean Elatides asiatica (Yok.) Krassil., subordinate Miroviaceae, rare ginkgoalean Pseudotorellia sp., and bennettite Nilssoniopteris rithidorachis (Krysht.) Krassil. The spores Gleicheniidites and pollen Taxodiaceaepollenites are dominant in the palyno spectrum of the coal interlayer. It was found that dominant taxodialeans and gleicheniaceous ferns with less abundant Miroviaceae, ginkgoaleans, and rare bennettites occurred in the Aptian swamp communities of the Partizansk basin. Shoots and leaves of Elatides asiatica, fronds of Birisia onychioides (Vassil. et K. M.) Samyl., are dominant in the burials of plants from the clastic rocks. The fragments of leaves of Nilssoniopteris, scale leaved conifers, and Ginkgo ex gr. adiantoides are rare. The disperse cuticle of these layers mostly includes Pseudotorellia sp.; however, its remains in burials were not found. The spores Laevigatosporites are dominant in the palynospectra from the clastic interlayers. Ginkgocycadophytus and taxa close to Pinaceae are plentiful among the pollen of gymnosperms.
Stratigraphy and Geological Correlation, 2014
The analysis of the composition of fossil palynomorphs from coals and clastic rocks of the Talynd... more The analysis of the composition of fossil palynomorphs from coals and clastic rocks of the Talyndzhan, Dublikan, Soloni, Chagdamyn, and Chemchuko formations of the Bureya coaliferous Basin revealed that the main coal forming plants during the Talyndzhan and Dublikan time were represented by cyatheaceous ferns, plants similar to Pinaceae, and plants produced Ginkgocycadophytus pollen. In the Soloni time, the boggy plant communities were composed of dominant Cyatheaceae, subordinate Pinaceae, rare Gleichenaceae representatives, and Ginkgocycadophytus producing plants. During the Chagdamyn time, the main coal forming role belonged to gleicheniaceous ferns, bryophytes, and lycopsids, while the Chemchuko time was marked by the dominant contribution of Gleicheniaceae, Cyatheaceae, Ginkgocycadophytus, and plants close to Taxodiaceae to the coal formation.
Review of Palaeobotany and Palynology, 1982
. Achene-like fossils from the Lower Cretaceous of the Lake Baikal area. Rev. Palaeobot. Palynol.... more . Achene-like fossils from the Lower Cretaceous of the Lake Baikal area. Rev. Palaeobot. Palynol., 36: 279--295. Aehene-like disseminules with a pappus of hypogynous hairs are described from the Lower Cretaceous lacustrine deposits of the Vitim River, Lake Baikal area. They are interpreted as uniovulate cupules with persistent receptacles bearing clusters of very long hairs. The receptacles can be occasionally detached from the cupules. Stone cells and tracheids of the cupule and the seed cuticles are described. In a single specimen, pollen grains are preserved at the top of the nucellus. They are monosulcate, showing alveolar exinal structure. These fossils are compared with bennettitalean strobili and cyperaceous achenes. The accompanying plants are mostly gymnosperms common in the Early Cretaceous Siberian province.
Russian Journal of Pacific Geology, 2009
Palynological complexes from the coaliferous Talyndzhan and Dublikan formations of the Bureya sed... more Palynological complexes from the coaliferous Talyndzhan and Dublikan formations of the Bureya sedimentary basin are analyzed. The palynological assemblage from the upper part of the Talyndzhan Formation is characterized by dominant gymnosperms largely close to Pinaceae and Ginkgocycadophytus. The content of ferns is insignificant against the background of their relatively high taxonomic diversity. The assemblage is marked by the last occurrence of Staplinisporites pocockii, Camptotriletes cerebriformis, C. nitida , and Cingulatisporites sanguinolentus spores typical of the Late Jurassic palynofloras. The palynological assemblage from the Dublikan Formation is dominated by Pteridophyts representing mainly by Cyathidites and Duplexisporites . In addition to the conifer, the role of Classopollis increased among the gymnosperms in this assemblage. It also includes the first-appearing Stereisporites bujargiensis, Neoraistrickia rotundiformis, Contignisporites dorsostriatus, Duplexisporites pseudotuberculatus, D. rotundatus, Appendicisporites tricostatus , and Concavissimisporites asper. These sporomorphs are characteristic of the Berriasian palynofloras. Thus, the Jurassic-Cretaceous boundary is most likely located between the Talyndzhan and Dublikan formations.
As indicated by the equal variability within two analysed groups of Lower Cretaceous cockroach fo... more As indicated by the equal variability within two analysed groups of Lower Cretaceous cockroach forewings, the section of the Siberian Baissa locality (Baissa of the Endandine Formation is the richest fossil insect site of the Lower Cretaceous) is found to be discontinual, thus denying the presence of the only recorded Mesozoic climatic oscillations in the world. Evidence is given that faunistic changes known in the Early Cretaceous (Berriasian-Valanginian) were not reversed. The top part of the Baissa section (designated herein) is found to be very rich in arthropods and plants, and contains warm and semiarid elements including the largest spider of that age. Climatic conditions during the Lowermost Berriasian are found to gradient, from wet, through humid up to semiarid. This inference changes the view on the evolution of biota, including insect societies, and angiosperm plants which evolved during that time. The same change from humid to arid conditions is recorded from several localities in China, which supports a Cretaceous rather than a Jurassic age for them. The paper emphasizes the role of cockroaches as a very fine stratigraphical tool.
Russian Journal of Pacific Geology, 2010
The analysis of the palynological spectra from the Gil'chin and Dim dinosaur localities of the Ze... more The analysis of the palynological spectra from the Gil'chin and Dim dinosaur localities of the Zeya-Bureya Basin revealed that the first of them is characterized by the high abundance of Filicales spores accompanied (in descending order) by tricolpate, bisaccate conifer pollen, Ginkgocycadophytus, Taxodi aceae, Cupressaceae, Taxaceae (TCT), Ulmoideipites, and "unica" type pollen. The spectra from the second site are dominated by Filicales spores and (second in significance) pollen of plants characteristic of river val ley communities (Platanaceae and Ulmaceae) accompanied by common bisaccate conifer pollen and subor dinate TCT and Ginkgocycadophytus pollen. The middle Maastrichtian bone bearing taphocoenoses of the Gil'chin and Dim localities were formed in spacious swamped river valleys covered by ferns and taxodialeans. The Platanaceae and Ulmaceae pollen implies the development of light forests in river valleys. The Ulmaceae pollen is indicative of highly variable environments in the mid Maastrichtian, probably, with an intermittent water influx. The low share of bissacate pollen in the palynospectra from these two localities is presumably determined by their remoteness from the slopes of the depression.
Historical Biology, 2014
Dispersed tricolpate pollen of Pseudointegricorpus clarireticulatum (Samoil.) Takah. from the Upp... more Dispersed tricolpate pollen of Pseudointegricorpus clarireticulatum (Samoil.) Takah. from the Upper Maastrichtian in Zeya-Bureya Basin, Amur (Heilongjiang) River area, Russian Far East/China has been studied with light and electron microscopy. Pollen size, pole outlines and the shape of equatorial projections show some variation within the species. The exine is striatereticulate, semitectate and columellate. The species is characterised by highly complex structures that have harmomegathic function and include equatorial projections, endexinous thickenings, difference in the thickness of the infratectum, foot layer and endexine throughout the pollen grain, and equatorial furrows. Exine layers taper towards colpi regions while they break abruptly in furrow regions. The furrows could have helped to shed the exine quickly and enabled pollen germination. A non-extended region with a small cavity in the ectexine was observed in the equatorial region. We think that this region is characteristic of most Triprojectate species.
Paleocene origin of the cockroach families Blaberidae and Corydiidae: Evidence from Amur River region of Russia
Zootaxa, 2013
Morphna paleo sp. n., the earliest winged representative of any living cockroach genus and the ea... more Morphna paleo sp. n., the earliest winged representative of any living cockroach genus and the earliest representative of the family Blaberidae, is described from the Danian Arkhara-Boguchan coal mine in the Amur River region (Russian Far East). The branched Sc and A suggest Ectobiidae (=Blattellidae) probably is not the ancestral family because Blaberidae were derived directly from the extinct family Mesoblattindae. The associated Danian locality Belaya Gora yielded Ergaula stonebut sp. n., the earliest record of the family Corydiidae. Both species belong to genera codominant in the Messel locality, thus validating their dominance in early Cenozoic assemblages.
Review of Palaeobotany and Palynology, 1988
. Gnetalean plants in the Jurassic of Ust-Balej, East Siberia. Rev. Palaeobot. Palynol., 53:359 3... more . Gnetalean plants in the Jurassic of Ust-Balej, East Siberia. Rev. Palaeobot. Palynol., 53:359 374. The gnetalean affinity of the samaras described by Heer as Ephedrites antiquus is supported and a new generic name Heerala is proposed for them. They are conceived as borne axillary to the bracts of a new bract genus Angarolepis. The Ephedra-like leaves from the same locality, assigned to a new leaf genus Cadmisega, might belong to the same plant. Its supposed pollen organs have previously been described as Kaidacarpum, a monocot fruit, and Equisetostachys, a spore cone.
Paleontological Journal, 2010
Coal forming plants from the Early Paleogene coal mines of the Zeya-Bureya Basin (Amur River Regi... more Coal forming plants from the Early Paleogene coal mines of the Zeya-Bureya Basin (Amur River Region) were studied. Dispersed cuticles of taxodialeans were obtained from coals for the first time in this region. Since the Danian, taxodialeans became dominant elements in peat forming environments and pro vided abundant plant material that transformed into coal.
Paleontological Journal, 2010
Two new species of Sphenobaiera from the Baisa locality and Chernovskoe coal mine (Lower Cre tace... more Two new species of Sphenobaiera from the Baisa locality and Chernovskoe coal mine (Lower Cre taceous, Transbaikalia) are described. The cuticle of these plants inhabiting different environments differs significantly. Leaves of S. starukhiniae sp. nov. have a very thin cuticle, almost not sunken, open, nonpro tected stomata, while the leaves of S. vitimica sp. nov. have relatively thick and strong cuticle, well developed papillae overhang the sunken stomata. Guard cells of both species usually have fine radial striations. Appar ently, the first plant dwelt in wet habitats, and the second, in the areas with a temporary shortage of water. This reconstruction is confirmed by sedimentological data, coal bearing sediments (where S. starukhiniae sp. nov. was found) formed in swampy areas, carbonate deposits (S. vitimica sp. nov. was collected in marls of the Baisa locality), in the droughty one. It is not improbable that the cuticular features revealed of these two species contributed to more efficient water exchange and allowed plants to exist in these different environments.
Paleontological Journal, 2007
Plant remains of Baierella R. Potonié (Ginkgoales) were found for the first time in the Lower Cre... more Plant remains of Baierella R. Potonié (Ginkgoales) were found for the first time in the Lower Cretaceous deposits of the Khilok Formation (Buryatia Republic), where they form a thin coal bed. A new species, B. averianovii , is described from the Krasnyi Yar locality. The monodominant burial of the new species in combination with pollen grains of Ginkgocycadophytus prevailing in the relevant palynological assemblage allows the authors to reconstruct a monospecific woody wetland plant community.
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Papers by Eugenia Bugdaeva